/Engine/Source/Runtime/MeshConversion/Public/ToDynamicMesh.h
Convert To FDynamicMesh. Will Copy GroupID to the mesh, and will create overlays with UVs, Normal, MaterialID (additionally Tangents and BiTangents if requested)
void Convert ( FDynamicMesh3 & MeshOut, const SrcMeshType & MeshIn, [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< int32(const [SrcTriIDType](API\Runtime\MeshConversion\TToDynamicMesh\SrcTriIDType) &SrcTrID)> GroupIDFunction, [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< int32(const [SrcTriIDType](API\Runtime\MeshConversion\TToDynamicMesh\SrcTriIDType) &SrcTrID)> MaterialIDFunction, bool bCopyTangents )